Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 634 · 40 questions

What you do (Coins × distance): 1. Balance the ruler on the pencil at its 15 cm mark. 2. Put coins at a measured distance on the left side. 3. Place coins on the right and slide them until the ruler balances. 4. Check: coins × distance on the left = coins × distance on the right; press gently.

1. 1.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a mirror (c) a flat table (d) a round pencil
2. 2.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) the left side (c) neither, it balances (d) both go up
3. 3.True or false: yeast is not needed for the ruler lever. (a) False (b) True
4. 4.True or false: a ramp is an inclined plane. (a) False (b) True
5. 5.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
7. 7.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a magnet (d) a flat table
9. 9.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a battery cell (c) coins of one kind (d) a 30 cm ruler
11. 11.True or false: a mirror is needed for the ruler lever. (a) True (b) False
12. 12.🧺 Which of these is needed for the ruler lever? (a) yeast (b) coins of one kind (c) a mirror (d) a magnet
13. 13.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
14. 14.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) a lever boosts your push (d) the spoon is magnetic
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
16. 16.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
17. 17.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a slide (c) a crowbar (d) a crane
18. 18.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) turmeric powder (c) yeast (d) a balloon
19. 19.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
20. 20.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
21. 21.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) bend it till it snaps (d) stand on the ruler
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
23. 23.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a battery cell (d) turmeric powder
24. 24.⚙️ Which of these uses a pulley? (a) a crowbar (b) a bottle opener (c) a see-saw (d) a flagpole
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
26. 26.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
28. 28.True or false: a magnet is needed for the ruler lever. (a) False (b) True
29. 29.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we keep it the same (b) we change it (c) we measure it
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) turmeric powder (d) a flat table
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
33. 33.⚙️ Which of these is a lever? (a) a well pulley (b) a doorknob (c) a bottle opener (d) a crane
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we keep it the same (b) we measure it (c) we change it
35. 35.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a flat table (d) turmeric powder
36. 36.True or false: a slide is an inclined plane. (a) True (b) False
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the same ruler (b) distance from the pencil (c) where the pencil is (d) which side goes down
39. 39.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False

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